<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <button>fetch</button>
    <script>
        const btn = document.querySelector('button');
        btn.onclick = function() {
            fetch('http://127.0.0.1:8080/fetch-server', {
                method: 'POST',
                headers: {
                    name: 'wzc'
                },
                body: 'username=wzc&password=123456'
            }).then(Response => {
                return Response.json();
            }).then(Response => {
                console.log(Response);
            })
        }
    </script>
</body>

</html>